JP4985557B2 - Electromagnetic clutch and grounding method of electromagnetic clutch - Google Patents

Description

  The present invention relates to an electromagnetic clutch for intermittently transmitting rotational power and a method for fixing the ground of the electromagnetic clutch.

  As shown in FIG. 8, as a ground structure in the electromagnetic clutch, a body that pulls out the ground side end portion 103 of the electromagnetic coil 102 housed in the stator housing 101 to the outside of the stator housing 101 and contacts the outer peripheral surface of the stator housing 101. There is a ground structure.

  However, in the conventional electromagnetic clutch, the ground side end 103 is caulked to the eyelet terminal 104, and the eyelet terminal 104 is caulked to the stator housing 101. Therefore, the stator housing 101 is provided with a protrusion 105 for caulking the eyelet terminal 104. This has led to an increase in processing man-hours. Further, the caulking process between the earth side end portion 103 and the eyelet terminal 104 and the caulking process between the eyelet terminal 104 and the projection 105 of the stator housing 101 are necessary, and the work is complicated.

Furthermore, since there are two electrical contacts between the ground side end 103 and the eyelet terminal 104 and between the eyelet terminal 104 and the protrusion 105, it is difficult to ensure conduction reliability. Further, since the eyelet terminal 104 is essential, there is a problem that the number of parts increases.
Japanese Utility Model Publication No. 58-32021

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a body grounding structure that can be fixed to the ground easily without increasing the number of processing steps and the number of parts in the electromagnetic clutch. There is.

[Means of Claim 1]
The electromagnetic clutch according to claim 1 includes an electromagnetic coil that generates an electromagnetic force when energized, a stator housing that houses the electromagnetic coil, a rotor that rotates by receiving a rotational force transmitted from a driving force source, An armature that is attracted to the rotor by the generated electromagnetic force and rotates integrally with the rotor is provided, and the rotational force from the driving force source is transmitted to the driven device connected to the armature.

Further, an arm support for fixing the stator housing to the housing of the driven device is fixed to one axial end surface of the stator housing.
And the earth | ground side edge part of an electromagnetic coil is pulled out to the one end side of a stator housing, and is crimped and fixed to the crimping part provided in the arm support.
Further, the caulking portion has a sharp convex portion at a portion that comes into contact with the ground side end portion when caulking.

According to this, body earthing can be performed by a single caulking process, and man-hours can be reduced. Further, since the caulking portion is provided on the arm support, the caulking portion is easily processed as compared with the case where the caulking portion is formed on the stator housing itself.
In addition, since the ground side end is caulked directly to the arm support, the number of parts does not increase. In addition, since electrical contact is only required at one location between the caulking portion and the ground side end portion, it is easy to ensure conduction reliability.
Further, at the same time as the caulking process, at the same time as the caulking, the insulating film at the end on the ground side can be partially removed with a sharp convex portion to ensure conduction.

[Means of claim 2]
According to the electromagnetic clutch according to claim 2, the caulking portion has a caulking piece formed by bending a protrusion extending toward the outer diameter side of the arm support toward one end side in the axial direction, and the caulking piece is grounded. The side end portion is sandwiched and the caulking piece is pressed, so that the ground side end portion is caulked and fixed to the caulking portion.
According to this, a caulking part can be easily formed only by bending a part of the arm support.

[Means of claim 3]
According to the electromagnetic clutch of the third aspect, the caulking portion is formed so that the bending angle of the caulking piece is 45 ° or less in a state before caulking.
According to this, it is easy to carry out caulking and the shape after caulking is also good.

[Means of claim 4]
According to the electromagnetic clutch of the fourth aspect, the caulking portion is formed in a state before the caulking, so that the bending inside R is ½ or more of the wire diameter of the ground side end portion.
According to this, the degree to which the ground side end portion is crushed by caulking is small, and there is no possibility of breakage due to caulking of the ground side end portion.

[Means of claim 5 ]
According to the electromagnetic clutch of the fifth aspect , the stator housing has an annular groove so as to have a U-shaped cross section, and the electromagnetic coil is accommodated in the annular groove, and one end side thereof is formed by the bottom wall of the annular groove. The ground side end portion is drawn out from a through hole penetrating the bottom wall, and the caulking portion is provided at a position close to the through hole in the arm support.
According to this, since the distance from the through hole to the caulking portion is shortened, the length of the ground side end portion to be drawn out can be shortened, so that the ground side end portion is moved outside the stator housing over a long distance. , Improve reliability.

[Means of claim 6 ]
According to the electromagnetic clutch of the sixth aspect, the insulating bush is fitted into the through hole so as to protrude from one end of the stator housing, and the ground side end portion is inserted into the insulating bush, so that one end side of the stator housing is inserted. is led in, the one end surface of the insulating bush, while along the ground-side end portion and a groove for guiding the caulking portion is formed the ground-side end portion, the depth of the groove, the ground-side end It is set larger than the wire diameter of the part.

  According to this, for example, even when an object contacts from one end side of the arm support during the assembly process of the electromagnetic clutch, the ground side end is protected by the insulating bush and the object does not directly contact the ground side end. Absent. For this reason, it is possible to avoid breakage of the end portion on the ground side during the assembly process.

[Means of Claim 7 ]
According to the ground fixing method of the electromagnetic clutch according to claim 7, the ground side end portion of the electromagnetic coil is pulled out to one end side of the stator housing, and the stator housing fixed to one end surface in the axial direction of the stator housing is driven. Clamp the grounded end on the arm support for fixing to the device housing.
The caulking portion formed on the arm support is formed with a sharp convex portion at a portion in contact with the ground side end portion, and the surface of the ground side end portion is finely damaged by the convex portion when caulking. Attach and caulk at the same time, and remove the insulation film on the ground side.
According to this, it is possible to remove the insulating coating at the end on the ground side simultaneously with caulking, and to reduce the number of processing steps.

  The electromagnetic clutch of the best mode 1 includes an electromagnetic coil that generates an electromagnetic force when energized, a stator housing that houses the electromagnetic coil, a rotor that rotates by receiving a rotational force transmitted from a driving force source, and generation of the electromagnetic coil And an armature that is attracted to the rotor by the electromagnetic force that rotates and rotates integrally with the rotor, and transmits the rotational force from the driving force source to the driven device connected to the armature.

Further, an arm support for fixing the stator housing to the housing of the driven device is fixed to one axial end surface of the stator housing.
And the earth | ground side edge part of an electromagnetic coil is pulled out to the one end side of a stator housing, and is crimped and fixed to the crimping part provided in the arm support.

The caulking portion has a sharp convex portion at a portion that comes into contact with the ground side end portion when caulking.
The caulking portion has a caulking piece formed by bending a projection extending toward the outer diameter side of the arm support toward one end side in the axial direction. The caulking piece sandwiches the ground side end portion, and the caulking piece is pressed. Thus, the end on the ground side is caulked and fixed to the caulking portion.
The caulking portion is formed in a state before caulking so that the bending angle of the caulking piece is 45 ° or less, and the bending inside R is not less than ½ of the wire diameter of the ground side end portion.

The stator housing has an annular groove so as to have a U-shaped cross section, the electromagnetic coil is accommodated in the annular groove, one end side is covered by the bottom wall of the annular groove, and the ground side end is formed on the bottom wall. The caulking portion is pulled out from the penetrating through hole and is provided at a position close to the through hole in the arm support.
An insulating bush is fitted into the through hole so as to protrude from one end of the stator housing, and the ground side end is inserted into the insulating bush and pulled out to one end of the stator housing. Has a groove for guiding the earth side end portion to the caulking portion along the earth side end portion, and the depth of the groove is set larger than the wire diameter of the earth side end portion. .

The ground fixing method for the electromagnetic clutch of the best mode 1 is that the ground side end of the electromagnetic coil is pulled out to one end side of the stator housing, and the stator housing fixed to one end surface in the axial direction of the stator housing is the housing of the driven side device. Clamp and fix the pulled-out end of the earth side to the arm support for fixing to. At that time, the caulking portion formed on the arm support is formed with a sharp convex portion at a portion in contact with the ground side end portion, and by this convex portion, the surface of the ground side end portion is finely scratched, At the same time as the caulking, the insulating film at the end on the earth side is removed.
Hereinafter, specific embodiments will be described with reference to the drawings for three examples. However, Examples 1 and 2 are reference examples showing an example to which the present invention is not applied, and Example 3 shows an example to which the present invention is applied. In addition, in each figure, the same code | symbol is attached | subjected to the common element and the overlapping description is abbreviate | omitted.

[Configuration of Example 1]
The structure of the electromagnetic clutch 1 of Example 1 is demonstrated using FIGS.
The electromagnetic clutch 1 is attached to, for example, a refrigerant compressor (driven device, not shown) of an automotive air conditioner, and intermittently transmits engine rotational power to the refrigerant compressor.

  The electromagnetic clutch 1 is generated by an electromagnetic coil 2 that generates an electromagnetic force when energized, a stator housing 3 that houses the electromagnetic coil 2, a rotor 4 that rotates in response to a rotational force transmitted from the engine, and an electromagnetic coil 2. An armature 5 that is attracted to the rotor 4 by electromagnetic force and rotates integrally with the rotor 4 is provided.

  The electromagnetic coil 2 is a known coil in which a conductive wire such as a copper wire with an insulating coating is wound, and is an exciting coil that generates a magnetic force when energized and demagnetizes when the energization is stopped.

  The stator housing 3 has an annular groove 8 so as to have a U-shaped cylindrical shape, and the bottom wall 9 of the annular groove 8 covers one end side in the axial direction of the electromagnetic coil 2 in the annular groove 8. The electromagnetic coil 2 is accommodated and fixed by the mold resin 10. The stator housing 3 is made of, for example, SPHE or SPHD, and forms a magnetic circuit (magnetic path) of the electromagnetic coil 2 together with the rotor 4 and the armature 5.

Further, the bottom wall 9 is provided with a through hole 13 for drawing out the end 11 of the electromagnetic coil 2 and the lead wire 12, and an insulating bush 15 made of, for example, EPDM is fitted into the through hole 13. Yes.
The insulating bush 15 is provided with an insertion hole 16 through which the ground side end portion 11 is inserted and an insertion hole 17 through which the lead wire 12 is inserted (see FIG. 6A), and the ground side end portion 11 and the lead wire 12 are inserted. Is inserted into the insulating bush 15 and pulled out to one end side of the stator housing 3.

  An arm support 19 for fixing the stator housing 3 to a housing (not shown) of the refrigerant compressor is fixed to one end face 18 in the axial direction of the stator housing 3 by welding or the like.

  The rotor 4 is made of a magnetic material such as iron or low carbon steel, is formed in a U-shaped cylindrical shape that covers the electromagnetic coil 2 supported by the stator housing 3 from one end side, and is provided on the inner peripheral side. A ball bearing 22 is rotatably supported by the housing of the refrigerant compressor. A pulley 23 is provided on the outer periphery of the rotor 4, and the rotational power of the engine is transmitted to the rotor 4 via a belt (not shown) that spans the pulley 23.

The armature 5 is formed in an annular shape and is disposed to face the rotor 4. A hub 24 connected to the shaft of the refrigerant compressor is connected to the armature 5 via an elastic member 25.
Then, the armature 5 is attracted to the rotor 4 side by electromagnetic force generated by energization of the electromagnetic coil 2, and the rotational power of the rotor 4 is transmitted to the armature 5, and is transmitted to the refrigerant compressor via the hub 24.

[Features of Example 1]
In the electromagnetic clutch 1 according to the first embodiment, the ground-side end portion 11 drawn to one end side of the stator housing 3 is caulked and fixed to a caulking portion 28 provided on the arm support 19.

The arm support 19 is a metal plate-like member having a substantially octagonal annular shape, and is formed of, for example, SPCC. Further, a trapezoidal notch 29 for avoiding interference with the through hole 13 is provided on one side of the octagon (see FIG. 5A).
The arm support 19 has a protrusion 30 extending so as to protrude from one oblique side of the trapezoidal notch 29 to the outer diameter side, and the caulking portion 28 is formed by the protrusion 30. Thereby, the caulking portion 28 is provided at a position close to the through hole 13.

  The caulking portion 28 includes a caulking piece 31 formed by bending the protrusion 30 toward one end side in the axial direction, and the earth-side end portion 11 can be sandwiched by the caulking piece 31 so that the earth-side end portion 11 can be caulked. It has a structure.

  The caulking portion 28 is formed so that the bending angle θ of the caulking piece 31 is 45 ° or less (preferably 10 ° to 45 °) before being caulked. It is formed so as to be not less than ½ of the wire diameter of the end portion 11 (see FIG. 5B).

  Further, a groove 34 is formed on the one end surface 33 of the insulating bush 15 to guide the ground side end 11 to the caulking portion 28 along the ground side end 11, and the depth h of the groove 34 is It is set larger than the wire diameter d of the ground side end 11 (see FIG. 6B). A curved portion 35 is provided between the insertion hole 16 and the groove 34 so that the ground side end portion 11 can be smoothly bent from the insertion hole 16 and extend along the groove 34. As a result, the ground side end portion 11 drawn out from the insertion hole 16 is guided to the caulking portion 28 along the groove 34.

  As shown in FIG. 6 (c), a notch 36 is provided by cutting the insulating bush 15 in the axial direction along the running direction of the groove 34 from the outer periphery of the insulating bush 15 to the insertion hole 16. The ground side end 11 may be inserted into the hole 16. The cut 36 may be cut from the outer periphery of the insulating bush 15 into the insertion hole 16 along a direction perpendicular to the traveling direction of the groove 34.

[Earth Fixing Step of Electromagnetic Clutch 1 of Example 1]
First, the electromagnetic coil 2 is accommodated in the annular groove 8 of the stator housing 3, and the ground side end portion 11 and the lead wire 12 are pulled out from the through hole 13.
Next, the ground end 11 is passed through the insertion hole 16 of the insulating bush 15, the lead wire 12 is passed through the insertion hole 17, and the insulating bush 15 is fitted into the through hole 13.

Then, the mold resin 10 is injected from the open side (the other end side) of the annular groove 8 to fix the electromagnetic coil 2 in the annular groove 8.
Finally, after removing the insulating coating on the ground side end portion 11, the ground side end portion 11 is arranged in the portion of the caulking portion 28 within the bend R, the ground side end portion 11 is sandwiched between the caulking pieces 31, and the caulking piece 31 is pressed and the ground side end 11 is caulked and fixed to the arm support 19.

[Effect of Example 1]
In the electromagnetic clutch 1 according to the first embodiment, the ground-side end portion 11 drawn to one end side of the stator housing 3 is caulked and fixed to a caulking portion 28 provided on the arm support 19.
According to this, body earthing can be performed by a single caulking process, and man-hours can be reduced. Further, since the caulking portion 28 is provided on the arm support 19, the caulking portion 28 can be easily processed as compared with the case where the caulking portion 28 is formed on the stator housing 3 itself.
Further, since the ground end 11 is directly caulked to the arm support 19, the number of parts does not increase. Furthermore, since only one electrical contact is required between the caulking portion 28 and the ground side end portion 11, it is easy to ensure conduction reliability.

Further, the caulking portion 28 has a caulking piece 31 formed by bending a protrusion 30 extending toward the outer diameter side of the arm support 19 toward one end side in the axial direction. The ground side end portion 11 is caulked and fixed to the caulking portion 28 by being sandwiched and the caulking piece 31 being further pushed and bent.
According to this, the caulking portion 28 can be easily formed only by bending a part of the arm support 19.

Further, the caulking portion 28 is formed so that the bending angle θ of the caulking piece 31 is 45 ° or less in a state before caulking.
According to this, it is easy to carry out caulking and the shape after caulking is also good.
Further, the caulking portion 28 is formed so that the bending radius R is ½ or more of the wire diameter of the ground side end portion 11 in a state before caulking.
When the bending inner radius R is smaller than ½ of the wire diameter of the ground side end 11, the ground side end 11 is highly crushed by caulking and may cause breakage due to caulking of the ground side end 11. However, in this embodiment, since the bending radius R is set to 1/2 or more of the wire diameter of the ground side end portion 11, there is no possibility of the ground side end portion 11 being broken.

Further, the caulking portion 28 is provided at a position close to the through hole 13 of the arm support 19.
According to this, since the distance from the through hole 13 to the caulking portion 28 is shortened, the length of the ground-side end portion 11 to be pulled out can be shortened, and therefore the ground-side end portion 11 is moved outside the stator housing 3 over a long distance. Compared to the case, the reliability is improved.

  Further, a groove 34 is formed on one end face 33 of the insulating bush 15 so as to guide the ground side end 11 to the caulking part 28 along the ground side end 11. It is set larger than the wire diameter of the side end portion 11.

  According to this, for example, even when an object contacts from one end side of the arm support 19 during the assembly process of the electromagnetic clutch 1, the ground side end portion 11 is protected by the insulating bush 15, and the object is connected to the ground side end portion 11. There is no direct contact. For this reason, it is possible to avoid breakage of the ground side end portion 11 during the assembly process or the like.

In the ground fixing method of the electromagnetic clutch 1 according to the second embodiment, when caulking, an electric current is passed between the caulking portion 28 formed on the arm support 19 and the stator housing 3 and caulking, and at the same time, self-heating causes the earth side end. The insulating coating on the part 11 is removed.
According to this, at the same time as the caulking, the insulating coating of the ground side end portion 11 can be removed, and the number of processing steps can be reduced.

The structure of the electromagnetic clutch 1 of Example 3 is demonstrated using FIG.
In the third embodiment, the caulking portion 28 has a sharp convex portion 38 at a portion that contacts the ground-side end portion 11 when being caulked. That is, a sharp convex portion 38 is formed in advance on one end surface 39 of the projection 30, and the projection 30 is bent to form the caulking portion 28.
For example, the convex portions 38 are fine and sharp convex portions 38 formed at both ends of a concave portion 40 in the shape of a tool formed by pressing a blade-shaped tool against one end surface 39 of the protrusion 30.

In the ground fixing method of the third embodiment, when the caulking is performed, the surface of the ground side end portion 11 is finely scratched by the convex portion 38, and at the same time, the insulating coating on the ground side end portion 11 is removed.
According to this, at the same time as the caulking, the insulating coating of the ground side end portion 11 can be removed, and the number of processing steps can be reduced.

[Modification]
In the electromagnetic clutch 1 according to the first to third embodiments, the caulking portion 28 is formed by the protrusion 30 extending toward the outer diameter side of the arm support 19, and the caulking piece formed by bending the protrusion 30 toward one end side in the axial direction. 31 is provided, however, the arm support 19 may be provided with a cut-and-raised portion, and the cut-and-raised portion may be used as the caulking portion 28.

It is a perspective view which shows the body earth structure of an electromagnetic clutch (Example 1). (Example 1) which is a block diagram of an electromagnetic clutch. (Example 1) which is the axial direction view which looked at the body earth structure from the one end side. (Example 1) which is the AA cross section of FIG. (A) It is an axial view of an arm support, (b) is an enlarged side view of a caulking part (Example 1). (A) is an axial view of an insulating bush, (b) is a BB sectional view of (a), and (c) is an axial view of an insulating bush (Example 1). (A) is explanatory drawing of the convex part formed in protrusion, (b) is CC sectional drawing of (a) (Example 3). (A) is a perspective view which shows the body earth structure of an electromagnetic clutch, (b) is a sectional side view of a stator housing (conventional example).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electromagnetic clutch 2 Electromagnetic coil 3 Stator housing 4 Rotor 5 Armature 8 Annular groove 9 Bottom wall 11 Ground side end 13 Through hole 15 Insulating bush 18 One end surface of stator housing in the axial direction 19 Arm support 28 Caulking portion 30 Projection 31 Caulking piece 33 Insulating bush one end face 34 Groove 38 Convex part 40 Concave part

Claims (7)

An electromagnetic coil that generates electromagnetic force when energized;
A stator housing that houses the electromagnetic coil;
A rotor that rotates in response to a rotational force transmitted from a driving force source;
An armature that is attracted to the rotor by the electromagnetic force generated by the electromagnetic coil and rotates integrally with the rotor;
An electromagnetic clutch for transmitting a rotational force from the driving force source to a driven device connected to the armature;
An arm support for fixing the stator housing to the housing of the driven device is fixed to one axial end surface of the stator housing,
The earth-side end of the electromagnetic coil is pulled out to one end of the stator housing and is fixed by caulking to a caulking portion provided in the arm support ,
The electromagnetic clutch according to claim 1, wherein the caulking portion has a sharp convex portion at a portion that contacts the ground-side end portion when caulking . The electromagnetic clutch according to claim 1,
The caulking portion has a caulking piece formed by bending a protrusion extending toward the outer diameter side of the arm support toward one end side in the axial direction,
The electromagnetic clutch, wherein the ground side end portion is sandwiched between the caulking pieces and the caulking piece is pressed, whereby the earth side end portion is caulked and fixed to the caulking portion. The electromagnetic clutch according to claim 2,
The electromagnetic clutch according to claim 1, wherein the caulking portion is formed so that a bending angle of the caulking piece is 45 ° or less in a state before caulking. The electromagnetic clutch according to claim 2 or 3 ,
The electromagnetic clutch according to claim 1, wherein the caulking portion is formed to have a bending inner radius R that is 1/2 or more of a wire diameter of the ground side end portion before being caulked. In the electromagnetic clutch in any one of Claims 1-4,
The stator housing has an annular groove so as to exhibit a U-shaped cross section,
The electromagnetic coil is housed in the annular groove, and one end side is covered by the bottom wall of the annular groove,
The ground side end is pulled out from a through hole penetrating the bottom wall,
The electromagnetic clutch , wherein the caulking portion is provided at a position close to the through hole in the arm support . The electromagnetic clutch according to claim 5 ,
An insulating bush is fitted into the through hole so as to protrude from one end of the stator housing,
The ground side end is inserted through the insulating bush and is drawn out to one end of the stator housing;
A groove for guiding the ground side end portion to the caulking portion along the ground side end portion is formed on one end surface of the insulating bush.
The depth of the said groove | channel is set larger than the wire diameter of the said earth | ground side edge part, The electromagnetic clutch characterized by the above-mentioned. An electromagnetic coil that generates electromagnetic force when energized;
A stator housing that houses the electromagnetic coil;
A rotor that rotates in response to a rotational force transmitted from a driving force source;
An armature that is attracted to the rotor by the electromagnetic force generated by the electromagnetic coil and rotates integrally with the rotor;
An electromagnetic clutch grounding fixing method for transmitting a rotational force from a driving force source to a driven device connected to the armature,
Pull out the ground side end of the electromagnetic coil to one end of the stator housing,
The ground side end portion is fixed by caulking to an arm support for fixing the stator housing fixed to one end surface in the axial direction of the stator housing to the housing of the driven side device,
In the caulking portion formed on the arm support, a sharp convex portion is formed at a portion in contact with the ground side end portion,
A grounding method for an electromagnetic clutch , characterized in that, when caulking, a fine scratch is made on the surface of the earth side end by the convex portion, and at the same time, the insulating coating on the earth side end is removed .

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